back beam

back beam

A localizer with both front beam and back beam.

No change in back bearing in this case as the aircraft is flying directly south.

A reciprocal beam on the other side of a transmitter and on a reciprocal heading, as in an ILS (instrument landing system) localizer. Aircraft on a back beam may not have glide-path information.back bearingi. The horizontal angle, measured clock-wise from a datum, and observed from an aircraft for a point over which it has passed without an intervening alteration of a heading. It is the reciprocal of track.ii. A bearing differing by 180°, or measured in the opposite direction from a given bearing. Also called a reciprocal bearing.iii. The bearing at the opposite end of a line from the observer as measured from the true meridian at the opposite end of the line. The back bearing on all lines (other than north-south lines) differs from the bearing at the observer's station by the amount of convergency of the meridians between the two points.

With the greatest weight component represented by the magnet pods, we tested a number of component concepts using a combination of pre-cut strong back beams and lock pins that literally let us build the Sea Patch on site," explained Palmer.

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